<!DOCTYPE html>
<html>

<head>
  <meta charset="UTF-8">
  <meta content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0;" name="viewport" />
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
  <style>
    .placeholder {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-color: #fff;
    }
    .loading {
      width: 80px;
      height: 40px;
      margin: 0 auto;
      margin-top: 100px;
    }

    .loading span {
      display: inline-block;
      width: 8px;
      height: 100%;
      border-radius: 4px;
      background: lightgreen;
      -webkit-animation: load 1s ease infinite;
    }

    @-webkit-keyframes load {
      0%,
      100% {
        height: 40px;
        background: lightgreen;
      }
      50% {
        height: 70px;
        margin: -15px 0;
        background: lightblue;
      }
    }

    .loading span:nth-child(2) {
      -webkit-animation-delay: 0.2s;
    }

    .loading span:nth-child(3) {
      -webkit-animation-delay: 0.4s;
    }

    .loading span:nth-child(4) {
      -webkit-animation-delay: 0.6s;
    }

    .loading span:nth-child(5) {
      -webkit-animation-delay: 0.8s;
    }
  </style>
</head>

<body>
  <div class="placeholder">
    <div class="loading">
      <span></span>
      <span></span>
      <span></span>
      <span></span>
      <span></span>
    </div>
  </div>
</body>

</html>